`bootimage test` failing with `ok` at the end of output about bootimage HOT 4 CLOSED

Thanks for the suggestion!

I think there is an even better solution: The qemu exit device supports setting an exit code, which we could use for indicating success/failure. We already do this in an integration test for the bootloader.

To implement this, we would need to check for the exit code in QEMU:

• If it's 0, do everything the same way as before for backwards compatibility.
• An exit code of 2 indicates success -> mark the test as succeeded without looking at the serial output
• An exit code of 3 indicates failure -> mark the test as failed and print every serial output after a special string such as failed\n or test failed:.

What do you think about this approach?

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I like that solution a lot! Would you like me to write the patch?

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@foeb That would be great!

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Implemented in #33

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